Method of taking up yarns of synthetic fibers

ABSTRACT

A method of taking up waste yarns of non-uniform quality occurring at the start and stoppage of taking up yarns onto waste yarn take-up members situated below, and coaxially with, take-up bobbins in a yarn take-up apparatus having many spindles, characterized in that the waste yarns are traversed on the said members.

United States Patent Hori et al.

[151 3,669,373 [451 June 13,1972

METHOD OF TAKING UP YARNS OF SYNTHETIC FIBERS Kikuo Hori; Yoshito Sato,both of Matsuyama, Japan Assignee: Teijin Ltd., Osaka, Japan Filed: July6, 1970 Appl. No.: $2,255

Related U.S. Application Data Continuation-impart of Ser. No. 726,156,May 2, 1968, abandoned.

Inventors:

Foreign Application Priority Data Field of Search ..s7/34 TI, 156, 157R; 1 81 5 1891 11 1 6 5 [5 6] References Cited UNITED STATES PATENTS3,245,215 4/1966 Graf ..242/26.1 X 3,172,619 3/1965 Rosenkranz et al....242/1 8 EW 2,035,721 3/1936 Reiners et al 242/18 EW 2,270,106 1/1942Boyce 242/18 EW 2,462,310 2/1949 Elvin et a1 ..242/26.44 2,942,4036/1960 Elliott et a1. ..57/34 TT 3,216,667 11/1965 Niederer 242/18 EW3,284,026 11/1966 Zuidema.... ..57/34 TT 3,319,409 5/ 1967 Bakker..57/34 T'l 3,356,312 12/1967 Briggs et a1. ..57/34 TT 3,356,313 12/1967Johnson et a1 ..242/18 EW Primary Examiner-John PetrakesAttorneyWenderoth, Lind & Ponack [57] ABSTRACT A method of taking upwaste yarns of non-uniform quality occurring at the start and stoppageof taking up yarns onto waste yarn take-up members situated below, andcoaxially with, take-up bobbins in a yarn take-up apparatus having manyspindles, characterized in that the waste yarns are traversed on thc idmem e a a 4 Claims, 5 Drawing Figures PATENTEnJun 1 3 I972 SHEET 10F 2TIME KIKUO HON mVDSHiTo 5M0,

INVENTOR' m/lgu wM/ M ATTORNEY .S

PATENTEnJuu 13 1972 3.669.373

sum 2 OF 2 INVENTORS K I KU O HORE YO SH I TO SATO ATTORNEYS METHOD OFTAKING UP YARNS F SYNTI-E'I'IC FIBERS This is a continuation-in-part ofapplication Ser. No. 726,156, filed May 2, 1968, now abandonedv Thisinvention relates to a method of taking up yarns of synthetic fibers.Particularly, the invention relates to a method of taking up waste yarnsonto separately provided waste spools or portions on bobbins apart fromthe packages of normal yarns with regularity by traversing them when theyarns are finally wound up onto take-up bobbins after having beentreated by an apparatus for heating, drawing, treating otherwise, andthen winding up, such as a ring twister, draw twister, heat-treatingtwister, bulk-processing twister and doubling twister. The production ofsuch waste yarns is derived from unusual passing speed of the yarns bothat the time of substituting empty bobbins for full bobbins and of newlypreparing the apparatus for operation.

When yarns of synthetic fibers are processed with the above-mentionedmachines, the yarns are wound up onto take-up bobbins. When the take-upbobbins become full a traverse mechanism goes out of a normal traversezone, and after a while, the full bobbins are exchanged with new ones.Then, the operation of the machine is resumed, and as soon as theprocessing is done in normal conditions, the traverse mechanism isreturned to the normal traverse zone.

In the exchanging of bobbins in this way, the speed of the yarns passingthe yarn processing zone of the machine changes from the normal speed toa decreasing (low), zero, again low, then normal speed. It is usual thatduring the change of the speed, too, the yarns are continuouslyprocessed in the processing zone of the yarn-processing apparatus. Forthis reason, the yarns which pass through the processing zone, forinstance, heating zone, during or about the time of exchanging thebobbins, are subjected to an abnormal treatment as compared with thepassing of the yarns during the normal period. Such abnormally treatedyarns become waste yarns. If the waste yarns are wound up onto a bobbintogether with normal yarns, the wound-up package contains yarns ofinferior quality, and becomes commercially valueless. Therefore, thewaste yarns are wound up onto separately provided waste spools bytransferring the traverse mechanism out of the normal traverse zone, oreven when they are wound up onto the same bobbins, the waste yarns arewound up onto the positions which are apart from the normal packageswhere the waste yarns are exclusively taken up. In this case, thebobbins for normal yarns must be made separate from the bobbins fortaking up waste yarns. I

In the conventional yarn processing apparatuses, however, waste yarnsare wound up onto waste spools or another position on bobbins withoutany traversing. When the exchanging of bobbins is effected many times,and a great quantity of waste yarns is wound, the package of the wasteyarns finally collapses, resulting in the loosening of the yarns, thecoming out of the yarns from the traveller, or the breakage of theyarns. Thus, it is impossible to effect a normal take-up by againreturning the traverse mechanism to a normal position. On the otherhand, it is not efficient to remove waste yarns every time bobbins havebeen exchanged.

According to this invention, a traverse is given to the yarns wound uponto waste spools. Even if a great quantity of waste yarns is wound up,the package does not collapse, and hence, the yarns are prevented fromcoming out of the traveller or from breaking.

This invention is characterized by winding up waste yarns on take-upmembers while traversing them by using a yarn processing take-upapparatus comprising many winding units in which the take-up members arepositioned bel0w,and coaxially with, take-up bobbins.

It is an object of the present invention to attain significantly moretimes of waste yarn winding than is experienced heretofore, avoid afailure of simultaneous resumption of take-up operation of manyspindles, prevent the yarn breakage and to avoid the contamination offinal products, all by taking up waste yams while traversing them.

With reference to the accompanying drawings:

FIG. 1 is a graph showing the traverse and the take-up of a waste yarnin the conventional take-up operation;

FIG. 2 is a view showing a package on a bobbin and a waste yarn take uponto a waste spool in the conventional take-up operation;

FIG. 3 is a graph showing the traverse of the take-up method of theinvention and the traverse for the taking up of a waste yarn;

FIG. 4 is a view showing a package wound up by the invention and apackage of a waste yarn; and

FIG. 5 is a partially schematic view of one form of traverse mechanismfor use in performing the present invention.

In the drawings, the same reference numerals indicate the same parts.

In FIG. 1, the abscissa represents time, and the ordinate, the width oftraverse. The portion a shows a state at the time when the traversemechanism is under the normally wound up package and waste yarns aretaken up onto a waste spool. As the traverse mechanism remainsstationary at this position, the straight line a continues for some timeas shown in the drawing. A waste yarn on a waste spool 1 therefore formsa disorderly arranged package, as is seen from FIG. 2 in which a wastespool is fitted on a spindle 5, a bobbin 3 is fitted on the same spindleat a position above the waste spool, and a normal yarn being wound uponto this bobbin. The reference numeral 4 shows a package of the normalyarns.

The portion b of FIG. 1 shows the state of a normal traverse in whichthe yarn take-up is carried out while forming a package 4. With theprogress of the take-up, the width of the traverse becomes graduallydecreased, and a package of the shape shown in FIG. 2 is formed on thebobbin 3. When the normal take-up operation is completed and the bobbin3 becomes full, the traverse mechanism is displaced to a downwardposition. Although the operation of the machine is suspended, the stateshown by c in FIG. 1 continues for some time by the moment of inertia ofthe machine, and the yarn is further wound up onto the waste spool l bysome length, until the machine comes to a complete halt. Then, the fullbobbin is removed away by cutting the yarn at a portion hanging betweenthe bobbin and the waste spool, and is exchanged with a new bobbin. Whenthe operation of the machine is resumed, the traverse mechanism remainsat the downward position for a while and causes some length of the yarnto be wound up onto the waste spool. When the yarn becomes a normal yarnand advances to the waste spool, the traverse mechanism again returns tothe upward normal take-up position and forms a normal package on thebobbin 3. The abovementioned cycle is repeated, and the yarn take-up isperformed. While the traverse mechanism is at the downward position inthe above cycle, the yarn advances in the processing zone (not shown) atan abnormal speed. At the time of newly starting the operation of themachine, too, the yarn advances in an abnormal state (by-passes a partor whole of the treating zone). Hence, the yarn taken up onto the wastespool during this time is a so-called waste yarn which difi'ers inquality from the yarn wound up onto the bobbin at an upward position.When the traverse mechanism changes its operation range either upwardsor downwards, some length of the yarn stays about the position shown byl in FIG. 2. In exchanging the bobbin, the yarn at this position is cutoff and the bobbin is taken away from the spindle. At the time of thefirst exchange of the bobbin, only a relatively small amount of thewaste yarn occurring at the time of newly starting the operation of themachine is wound onto the waste spool. It is usual therefore that thewaste spool is not exchanged every time, but is exchanged after thebobbin has been exchanged several times and a considerable amount of thewaste yarn has been wound up onto the waste spool. If the waste spool isexchanged every time the bobbin is exchanged, the operation of themachine should be newly started every time, thus resulting in thedecrease of operational efficiency.

I-Ieretofore, in the prior art a yarn has been disorderly wound up ontoa waste spool without any traversing, and therefore, the package hascollapsed even if an amount of the waste yarn on the waste spoolslightly exceeds the prescribed amount. The yarn is then loosened, andis swung around in a bundle, thus causing the yarn from the traveller tocome ofi from it, or to be broken. Even when the traverse mechanismrises to the normal yarn take-up position, the yarn take-up cannot beresumed. Frequent exchanging of the waste spool in an attempt to makethe amount of the yarn to be wound onto the waste spool smaller, andthus remove the above-mentioned defects has resulted in a remarkabledecrease in operational efficiency.

The present invention has been accomplished with a view to removingthese defects of the prior art. As shown in FIG. 3 even when thetraverse mechanism is situated at a downward position, the traversing iseffected at a stroke smaller than that of a normal traverse, and anorderly package is formed on a waste spool. This small width traverse isthe only difference between the take-up method shown in FIGS. 3 and 4and FIGS. 1 and 2.

It is to be understood that any conventional yarn traverse mechanismcould be readily adapted to traverse both the yarn take-up bobbin andthe yarn waste bobbin. However, one such apparatus will be described nowwith reference to FIG. 5 of the drawings.

A yarn traverse bar 9 having a thread guide 11 at its end is positionedto reciprocate parallel to the axis of bobbins 3 and l. Traverse bar 9may conveniently be of a flexible material and if necessary may extendaround a guide roll 10. The upper portion of traverse bar 9 may beintegral with or attached to a piston bar 8. The other end of piston bar8 is attached to a piston 6 which is adapted to reciprocate within acylinder 7. Specifically piston 6 is adapted to reciprocate within twolengths, L and L in cylinder 7. Fluid conduits 13 provide access offluid into lengths L of cylinder 7. Suitable control valves such aselectromagnetic valves 15 selectively allow access of fluid from liquidfeed in storage tanks (not shown) to and from fluid lines 13. Thus,piston 6 is caused to selectively reciprocate within cylinder 7 throughthe length L It will be apparent that as piston 6 is reciprocatedthrough length L,, thread guide 11 and therefore yarn 12 will likewisebe reciprocated through length L on bobbin 3, thereby winding up theyarn.

Fluid lines 14 are similarly arranged to allow access of fluid intolength L of conduit 7. Suitable valves such as electromagnetic valves 16alternately and selectively allow fluid to enter and leave cylinder 7through conduits 14 from liquid feed and storage tanks (not shown). itwill be apparent that piston 6 may be selectively moved from length 1..to length L of cylinder 7. When this is done, the piston 6 will bereciprocated along the length L This reciprocation will of course betransferred to thread guide 11 and thus yarn 12. A waste yarn will thusbe traversed along waste spool 1 in the manner of the present invention.

When piston 6 is shifted from length L to length L a switch (not shown)is manually pushed to stop the action of a valve to the righthand(length L,) side of valve 15. Since in this case fluid does not flowthrough the valve to the right side of valve 15, piston 6 will not moveleft but moves from length L, to length L Conversely when piston 6 isshifted from length L to length L,, another switch (not shown) is pushedby hand to stop the action of a valve to the left hand (length L,) sideof valve 16.

it will be readily apparent that piston 6 may be shifted from length 1..to length L and vise versa in any suitable or desirable manner. Thus,the position of thread guide 11 will be simultaneously shifted.

It will further be apparent to those skilled in the art, that aconventional traverse ring may be substituted for the thread guide 11.The shifting and reciprocation of the traverse ring will be accomplishedin the same manner as above described.

According to the invention, traversing is effected even when thetraverse mechanism is situated at a lower portion and the yarn is beingwound up onto a waste spool. Hence, the yarn is orderly wound up withoutany resulting collapse of the package, coming ofi of the yarn from thetraveller and also without any yarn breakage. This makes it possible totake up a great quantity of yarn on a waste spool, reduce the number ofexchanging of the waste spool, and to enhance the operational efficiencyas'a whole.

EXAMPLE 1 The method of the invention was compared with the prior art inrespect of a method of taking up waste yarns at the start of yarnhooking and the start of take-up when drawn yarns 150 denier/47filament) of polyethylene terephthalate were twisted and taken up. Theresults are shown in the following table.

in both methods, the normal take-up speed is 500 m/min. At the time whenthe operation of the machine is newly started, the processing speed isdecreased to 250 m/min., and waste yarns are taken up onto waste-spools.At the end of passing yarns onto all spindles, the speed was returned toa normal one, and the normal take-up onto bobbins was started. An amountof the yarn wound up onto a bobbin was 2.1 Kg. The waste spool wasprovided with a collar at both ends, and had a diameter of 62 mm and alength of 48 mm. The width of a small traverse was 50 mm.

After the operation is newly started,

percentlst 2nd 3rd 4th dofiing dolfing dofiing dotting ConventionalMethod: Ratio of success in simultaneous start H 98 96. 5 92 Ratio ofyarn breakage during operation 0. 8 0. 9 1. 2 1. 3 Ratio ofcontamination of final products 0. 3 0. 7 0. 8 1. 5 Method of theinvention:

Ratio of success in simultaneous start 99. 6 100 98 Ratio of yarnbreakage during operation 0. 5 0. 8 0. 4 0. 5 Ratio of contamination offinal products It is seen from the above results that by a smalltraverse of the invention, the degree of success in simultaneous startis very excellent, and the ratio of the yarn breakage and thecontamination of the products are very small. This is because wasteyarns are orderly wound up onto waste spools, and no disorder orcollapse occurs as in the conventional method.

What is claimed is:

l. A method of collecting waste of nonuniform quality onto awastetake-up member located coaxially below a yarn take up bobbin in a yarntake-up apparatus, said waste occurring at the starting and stopping ofsaid yarn take-up apparatus, said method comprising traversing saidwaste back and forth along the length of said waste take-up member,whereby said waste is collected in an orderly manner and prevented fromcollapsing and breaking.

2. The method according to claim 1 wherein said waste yarn is traversedon the said take-up member by reciprocating a ring.

3. The method according to claim 1 wherein said waste yarn is traversedon the said take-up member by reciprocating said waste yarn takeupmember.

4. An apparatus for collecting the waste on the waste yam take-up memberas set forth in claim 1 comprising a traverse bar having a thread guideat its free end and being positioned to reciprocate in a directionparallel to the axis of the bobbins, a piston with a piston barattached, conveniently located relative to said traverse bar andactuated by fluid pressure to permit the piston bar to periodically makein a container cylinder its reciprocating motions corresponding to bothnormal yarn traversing motions and waste yarn traversing motions, saidpiston bar being connected to the upper portion of the traverse bar andvalves alternately and selectively allowing the fluid to enter and leavethe cylinder.

1. A method of collecting waste of nonuniform quality onto a wastetake-up member located coaxially below a yarn take-up bobbin in a yarntake-up apparatus, said waste occurring at the starting and stopping ofsaid yarn take-up apparatus, said method comprising traversing saidwaste back and forTh along the length of said waste take-up member,whereby said waste is collected in an orderly manner and prevented fromcollapsing and breaking.
 2. The method according to claim 1 wherein saidwaste yarn is traversed on the said take-up member by reciprocating aring.
 3. The method according to claim 1 wherein said waste yarn istraversed on the said take-up member by reciprocating said waste yarntake-up member.
 4. An apparatus for collecting the waste on the wasteyarn take-up member as set forth in claim 1 comprising a traverse barhaving a thread guide at its free end and being positioned toreciprocate in a direction parallel to the axis of the bobbins, a pistonwith a piston bar attached, conveniently located relative to saidtraverse bar and actuated by fluid pressure to permit the piston bar toperiodically make in a container cylinder its reciprocating motionscorresponding to both normal yarn traversing motions and waste yarntraversing motions, said piston bar being connected to the upper portionof the traverse bar and valves alternately and selectively allowing thefluid to enter and leave the cylinder.